From matthew.khouzam at ericsson.com  Fri May  1 15:31:43 2026
From: matthew.khouzam at ericsson.com (Matthew Khouzam)
Date: Fri, 1 May 2026 19:31:43 +0000
Subject: How to show method entry/exit in Trace Compass?
In-Reply-To: <CAJK_ieix5QAMUEhY4R4Cm5tUwZ_W98fG8wrb947GwCW3YR0tqQ@mail.gmail.com>
References: <CAJK_ieix5QAMUEhY4R4Cm5tUwZ_W98fG8wrb947GwCW3YR0tqQ@mail.gmail.com>
Message-ID: <DS4PPFB691D9211860531ADD6E93FC33BA79E322@DS4PPFB691D9211.namprd15.prod.outlook.com>

Hi David,

I would love to look into the "lost event". Can you share the trace? maybe it's an easy win.
________________________________
From: lttng-dev <lttng-dev-bounces at lists.lttng.org> on behalf of David Aldrich via lttng-dev <lttng-dev at lists.lttng.org>
Sent: Thursday, April 30, 2026 7:01 PM
To: lttng-dev at lists.lttng.org <lttng-dev at lists.lttng.org>
Subject: How to show method entry/exit in Trace Compass?

Hi

I'm using LTTng 2.13.11 on Ubuntu 24.04 with Trace Compass 11.3.0 on Windows, to analyse a C++ app.

I have used LTTng and Trace Compass a little to instrument our user space app using  lttng_ust_tracef(). I now want to show actual method entry/exit points in a Gantt type view.

With help from AI I instrumented entry/exit for one method. Babeltrace shows that the trace files contain those points:

<time> sr1  myapp:method_entry: { cpu_id = 4 }, { class = "ThreadPool", method = "mainLoop" }
<time> sr1 myapp:method_exit: { cpu_id = 6 }, { class = "ThreadPool", method = "mainLoop" }

But when I import the trace into Trace Compass I see the events but the trace shows only the app name, not the method name.

What am I missing? Is there a user guide article that would help me?

Best regards
David
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